class student :
    def __init__(self,name,id,age=19) -> None:
        self.name = name
        self.id = id
        self.age = age
s1 = student("小千",202406)
print(f"{s1.name}的年龄{s1.age}")
s2 = student("小千",202406,20)
print(f"{s2.name}的年龄{s2.age}")